/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-web-praise nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package com.sri.ai.lpitools.gwtgui.client.components.treeutil;

import java.util.ArrayList;

import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.view.client.AsyncDataProvider;
import com.google.gwt.view.client.HasData;
import com.sri.ai.lpitools.cobra.gwtutil.dataobjects.shared.TreeNode;
import com.sri.ai.lpitools.cobra.gwtutil.dataobjects.shared.TreeNode.NodeType;
import com.sri.ai.lpitools.cobra.gwtutil.dataobjects.shared.TreeNode.TreeType;
import com.sri.ai.lpitools.gwtgui.client.RPCService;

public class TreeNodeDataProvider extends AsyncDataProvider<TreeNode>{

	private final String nodeID;
	private ArrayList<TreeNode> emptyDataArray;
	private final String clientID;
	private final TreeType nodeType;

	public TreeNodeDataProvider(String nodeID, String clientID, TreeType nodeType)	{
		super();
		this.nodeID = nodeID;
		this.clientID = clientID;
		this.nodeType = nodeType;

		emptyDataArray = new ArrayList<TreeNode>();
		TreeNode nullNode = new TreeNode(nodeID + ".0", "No data available.", nodeType, NodeType.STRING, true);
		emptyDataArray.add(nullNode);		

		RPCService.Util.getInstance().getNodeChildren(nodeID, clientID, nodeType, new AsyncCallback<ArrayList<TreeNode>>() {

			@Override
			public void onFailure(Throwable caught) {
				TreeNodeDataProvider.this.updateRowCount(0, true);
				TreeNodeDataProvider.this.updateRowData(0, emptyDataArray);
			}

			@Override
			public void onSuccess(ArrayList<TreeNode> result) {
				if (result == null) {
					TreeNodeDataProvider.this.updateRowCount(0, true);
					TreeNodeDataProvider.this.updateRowData(0, emptyDataArray);
					return;
				}

				ArrayList<TreeNode> convertedResult = (ArrayList<TreeNode>) result;
				if(convertedResult.size() == 0) {
					TreeNodeDataProvider.this.updateRowCount(0, true);
					TreeNodeDataProvider.this.updateRowData(0, emptyDataArray);
					return;
				}
				TreeNodeDataProvider.this.updateRowCount(convertedResult.size(), true);
				TreeNodeDataProvider.this.updateRowData(0, convertedResult);
			}
		});
	}

	@Override
	protected void onRangeChanged(HasData<TreeNode> display) {

		emptyDataArray = new ArrayList<TreeNode>();
		TreeNode nullNode = new TreeNode(nodeID + ".0", "No data available.", nodeType, NodeType.STRING, true);
		emptyDataArray.add(nullNode);

		RPCService.Util.getInstance().getNodeChildren(nodeID, clientID, nodeType, new AsyncCallback<ArrayList<TreeNode>>() {

			@Override
			public void onFailure(Throwable caught) {
				TreeNodeDataProvider.this.updateRowCount(0, true);
				TreeNodeDataProvider.this.updateRowData(0, emptyDataArray);
			}

			@Override
			public void onSuccess(ArrayList<TreeNode> result) {
				if (result == null) {
					TreeNodeDataProvider.this.updateRowCount(0, true);
					TreeNodeDataProvider.this.updateRowData(0, emptyDataArray);
					return;
				}
				ArrayList<TreeNode> convertedResult = (ArrayList<TreeNode>) result;
				if(convertedResult.size() == 0) {
					TreeNodeDataProvider.this.updateRowCount(0, true);
					TreeNodeDataProvider.this.updateRowData(0, emptyDataArray);
					return;
				}
				TreeNodeDataProvider.this.updateRowCount(convertedResult.size(), true);
				TreeNodeDataProvider.this.updateRowData(0, convertedResult);
			}
		});
	}
}
